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When starting a line, I either create from a herd helper that gets the horses as close to possible as what I want and use all the free testing, or I buy from the foundation rescue because I know the quality of those horses and I know they'll all be about equivalent and good for breeding.

I never boost. Boosting a line makes it far harder to find suitable "new blood" to mix in to the line at a later date. However, some people do boost, and it's totally up to them.

If I GMT, it's generally stallions only. I can trust them to pass on the genes I care about more than the mares, even if it's not always guaranteed that the foal will be homozygous. Besides, then any foundation rescue mare is a suitable candidate for making more babies :)

In terms of culling, I expect B papered by second generation and A papered by third generation. I haven't gotten any regular create star stallions by fourth generation yet (though it is possible, with really strict culling I believe), so superior to sire and a benchmark stallion is essential by that generation. For mares, I expect them to be red papered by second generation and blue papered by the third (though if they paper red, I usually give them another shot breeding to a better stallion if I have one). If I have several horses to choose between that all meet those initial standards, then I geld/spay based on whether they have the colors I'm looking for. And if they're a good stallion but not the color I'm looking for, I'll offer him for sale and/or public breeding.

Stallion wise, I only keep superior to sire ones. I'll sell extra ones from time to time.
I only keep As for 3rd gen. Ideally I would like to see Stars by 5th, but I am still tweaking my lines. I most definitely would expect Star by 6th gen, since A can have 3 levels.

Mares, I prefer it if my mares paper blue at 3rd gen, but not a must. 4th gen mares must paper blue, however. I haven't had a mare paper gold, but I don't think I'll see any for a while because the vast majority of my mares are foundation, 2nd gen, 3rd gen and 4th gen. I only have a few 5th gen mares of breeding age.

And like HiLo said, I don't boost my foundations. I also GMT only the boys.

If this helps I started a Satin line. I GMTed my stallion and boosted. I have a few boosted mares as well but only if they are a rare gene. Also I DO still get superior to sire colts out of regular mares, although most of my mares are Rank Specials or Exceptionally Perfects or Ex Pros. Feel Free to troll my barn. Here's a link to my foundations. anything with a "z" in the name is an ET mare.

http://www.huntandjump.com/adv_search.php?status=any&ageg=&agel=&agee=&erag=&eral=&erae=&f_basic=name&f_adv=none&tattoo=&f_limit=25&stallion=1&mare=1&name=&name_lm=not+like&color=&color_lm=not+like&bty=1&foundation=1&sire=&dam=&barn=&owner=14546&breeder=&e1=&e2=&a1=&a4=&a2=&a3=&f1=&f2=&p1=&p2=&s1=&s2=&s3=&c1=&c2=&c3=&d1=&d2=&g1=&g2=&ch1=&ch2=&z1=&z2=&sa2=&sa1=&kit1=&kit2=&kit3=&kit4=&kit5=&kit6=&kit7=&kit8=&kit9=&kit10=&sp1=&sp2=&sp3=&pax31=&pax32=&rb1=&rb2=&o1=&o2=&l1=&l2=&ice1=&icei=&ice2=&ice3=&ice4=&ice5=&ice6=&ice7=&ice8=&brindle1=1&brindle2=1&wf1=1&wf2=1&wf3=1&wf4=1&wf5=1&wf6=1

I generally use 3 stallions per generation per season and since I pasture breed, it's random on how many foals each stallion ends up with. The results can be amusing though, since I've found half siblings as the parents of a few foals. I just roll with what I get from the pastures. Pasture breeding generally results in better lines over time since it helps with mare quality.